1 files changed, 55 insertions, 0 deletions
diff --git a/plugins/api.c b/plugins/api.c
index 54df72c1c0..81f43c9ce8 100644
--- a/plugins/api.c
+++ b/plugins/api.c
@@ -8,6 +8,7 @@
  *
  *  qemu_plugin_tb
  *  qemu_plugin_insn
+ *  qemu_plugin_register
  *
  * Which can then be passed back into the API to do additional things.
  * As such all the public functions in here are exported in
@@ -35,10 +36,12 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/main-loop.h"
 #include "qemu/plugin.h"
 #include "qemu/log.h"
 #include "tcg/tcg.h"
 #include "exec/exec-all.h"
+#include "exec/gdbstub.h"
 #include "exec/ram_addr.h"
 #include "disas/disas.h"
 #include "plugin.h"
@@ -410,3 +413,55 @@ uint64_t qemu_plugin_entry_code(void)
 #endif
     return entry;
 }
+
+/*
+ * Create register handles.
+ *
+ * We need to create a handle for each register so the plugin
+ * infrastructure can call gdbstub to read a register. They are
+ * currently just a pointer encapsulation of the gdb_reg but in
+ * future may hold internal plugin state so its important plugin
+ * authors are not tempted to treat them as numbers.
+ *
+ * We also construct a result array with those handles and some
+ * ancillary data the plugin might find useful.
+ */
+
+static GArray *create_register_handles(GArray *gdbstub_regs)
+{
+    GArray *find_data = g_array_new(true, true,
+                                    sizeof(qemu_plugin_reg_descriptor));
+
+    for (int i = 0; i < gdbstub_regs->len; i++) {
+        GDBRegDesc *grd = &g_array_index(gdbstub_regs, GDBRegDesc, i);
+        qemu_plugin_reg_descriptor desc;
+
+        /* skip "un-named" regs */
+        if (!grd->name) {
+            continue;
+        }
+
+        /* Create a record for the plugin */
+        desc.handle = GINT_TO_POINTER(grd->gdb_reg);
+        desc.name = g_intern_string(grd->name);
+        desc.feature = g_intern_string(grd->feature_name);
+        g_array_append_val(find_data, desc);
+    }
+
+    return find_data;
+}
+
+GArray *qemu_plugin_get_registers(void)
+{
+    g_assert(current_cpu);
+
+    g_autoptr(GArray) regs = gdb_get_register_list(current_cpu);
+    return create_register_handles(regs);
+}
+
+int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray *buf)
+{
+    g_assert(current_cpu);
+
+    return gdb_read_register(current_cpu, buf, GPOINTER_TO_INT(reg));
+}